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If you'll notice, one type of memory has numbers which are a bit higher than the other type. The higher numbers are potentially faster than the lower numbers. If you mix the two types in the same computer, the computer would go with the lower speed, so as to be able to use both types together.

You probably can mix the two, resulting in 6 GB for each machine. If so, then that would be a nice amount for each machine. I was unable to find the user guide for your computer, so I can't say for sure if you could mix the two. I suggest you call Dell and ask them that question. My biggest concern here is putting 2GB and 4GB in the same computer -- you may need to have the same capacity for both sticks. But that's not true with all computers. Some will let you mix and match. Hopefully yours is that way.

8 GB would be better than 6 GB, but not a lot better. 6 GB would be a good amount, and if you can achieve 6 GB in each machine, I would go with that. But if you can't combine it like that, then go with 8 in the one that now has 4.

Keyboard IBM Model M Hard Drives Two hard drives, 1TB each: One for Linux, one for my data. Antivirus Sophos (Linux), Trend Micro (Windows) Browser Firefox, Opera Other Info I use Samba to share my data drive with the other computers at my house and with my guest session in VMWare Workstation Player.

In theory what you are proposing should work and in practice usually does. But not always.
And there isn't any way to know ahead of time if your specific situation will work.

In the real world any mismatch of module capacity or specifications can be problematic. Even modules with otherwise identical specifications but from different manufacturers may fail. The best assurance of avoiding problems is to use matched modules.

It is also worth noting that OEM computers are often picky about the memory modules they will accept. And they generally have few if any settings to deal with such problems.

I have worked with a lot of Dell computers over the years. Generally, what I have seen has been that they will let you combine memory of different speeds with no problem; to accommodate this, the bus operates at the speed of the slower memory. Sometimes it is problematic to mismatch memory on capacity -- in your case, 2 GB + 4 GB together. But that sometimes works as well.

The one thing which will definitely cause it to fail is when you have a mismatch on the type of memory. But all memory is DDR3, so it should work.

If it was me, if the owner's manual didn't tell me any different, I would put a 2GB and a 4GB into each computer and see what would happen. If you power up and it shows less than 6 GB, or if it locks up during the boot process, then power down and put all identical memory in each computer.

Keyboard IBM Model M Hard Drives Two hard drives, 1TB each: One for Linux, one for my data. Antivirus Sophos (Linux), Trend Micro (Windows) Browser Firefox, Opera Other Info I use Samba to share my data drive with the other computers at my house and with my guest session in VMWare Workstation Player.

The specs for the E6410 show that the laptop motherboard has only space for two RAM modules.

The computer will support up to 8GB over the two DDR3 slots, so one of your laptops is already at max capacity.

The other laptop can take 8GB (2 x 4 GB) with matched dual channel modules. However if you stick in a 4GB module along side a 2GB module, I think the computer will only allow you to access 4GB. This is because of the design of the memory controller. So, it would be better to do away with the 2 x 2GB and replace it with 2 x 4GB modules.

Keyboard IBM Model M Hard Drives Two hard drives, 1TB each: One for Linux, one for my data. Antivirus Sophos (Linux), Trend Micro (Windows) Browser Firefox, Opera Other Info I use Samba to share my data drive with the other computers at my house and with my guest session in VMWare Workstation Player.

Keyboard IBM Model M Hard Drives Two hard drives, 1TB each: One for Linux, one for my data. Antivirus Sophos (Linux), Trend Micro (Windows) Browser Firefox, Opera Other Info I use Samba to share my data drive with the other computers at my house and with my guest session in VMWare Workstation Player.

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